With regards to the current classes, it typically takes 2-3 hours to consume the lectures (unless you have ADHD like me). 20 minutes to finish weekly exercises. 1-2 hours to finish the programming exercises in the ML class. The ML class also gave a crash course in programming Octave, which handled any language issues you may have for that course.

I took 2 classes, which is a huge time-sink (I can't even go through the textbooks). I think for a person with a full-time job, 1 course would be enough for a particular semester.